You have done the right thing leaving the thread OP. In fact I feel that your coming here in the first place revealed a desperation that I found quite disturbing. MN is not, and I suspect never will be the place to own being the OW. Too much bitterness coming - understandably - from personal experience, and with that an inability to see that often there are no rules regarding emotions, and who we love.
I feel that you need to seek counselling immediately. Only then will you be able to work through all the angst you are now suffering, in a safe, non judgemental, and confidential environment. There is so much that you have obviously left unsaid, and that is how it should be. To safeguard your familys happiness, you have not risked confiding in anyone in RL. A secret shared often isnt a secret anymore.
I do not condone what you are doing, but I can feel the pain you are suffering because of it, and the fact that you want to put things right. For that I believe you deserve support. Find the right counsellor, and finally set about taking back your life.
Incidentally, I was a wife who was cheated on many years ago now. I too was deeply hurt and very bitter for a long time, especially on my children`s behalf. You know what though, we got through it, and went on to have a very happy life. I found a truly special man, and my kids got the father they deserved.
I wish you all the luck in the world.